— Sorry, Professor Smith. I didn't finish the assignment yesterday.

— Oh, you _____ have done it as yesterday was the deadline. [ ]

A. must

B. mustn't

C. should

D. shouldn't

避免他人从后窗窥视家庭隐私，香港一家百叶窗企业在报上连续刊登题为“请留心你家的后窗”的销售广告，其生意顿时兴隆起来。其采用的公关传播模式为（）.

A.5W模式

C.两级传播模式

B.把关人模式

D.议题设置模式